DE2911461C2 - Layered body made of flexible, open-cell foam plastic - Google Patents

Description

The invention relates to a layered body made of flexible, open-cell foam plastic, the pores of which are filled with a hardened synthetic resin and which is covered on both sides with reinforcing fiber layers whose fibers are made of hardened synthetic resin are embedded. In a known laminate of this type (GB-PS 13 38 536) the pores of the Foam plastic and the fibers of the reinforcing fiber layers laid on both sides are filled with the same synthetic resin. The two opposite facing sides of the known laminate thus have the same properties.

The invention is based on the object of designing a layered body of the type described in such a way that that it has different mechanical and / or chemical properties on its two sides. Furthermore, a method for producing a such laminated body can be specified.

According to the invention, the object is on the one hand solved in that one of the two fiber layers and the pores of the adjacent half of the Foam plastic is embedded in a first, hardened synthetic resin or is filled by this, while the other fiber layer and the pores of the other half of the foam plastic adjacent to it is embedded in a second cured synthetic resin or filled by this, with a middle one Boundary layer contains both cured synthetic resins.

A second solution to the problem is, according to the invention, that the foam plastic of the laminated body consists of two layers and that the pores the one layer and the fiber layer facing this with a first hardened synthetic resin are filled or is embedded in this synthetic resin and that the pores of the second layer and those of this associated fiber layer with a second hardened Teten synthetic resin are filled or in this synthetic resin is embedded and that between the two foam plastic layers one of these two firmly together connecting boundary layer is present, which contains both synthetic resins

In an embodiment of the invention it is provided that the first synthetic resin is a polyester resin and the second is an epoxy resin.

The invention then relates to methods for producing the laminated bodies according to the invention. the end is gone from a known process at which the foam plastic is impregnated or coated with uncured synthetic resin, then with the Fiber layers are brought together, then this layering is compressed, forming the fiber layers are embedded in the synthetic resin, and finally the synthetic resin is cured. Such a thing The method is designed according to this part of the invention for the production of the initially proposed laminated body in such a way that the impregnation or coating with two different synthetic resin compositions takes place, one of which on the one side of the foam plastic, the other is applied to the other side. Becomes the

Impregnate one side of the foam plastic, for example, a polyester resin used with one color is pigmented and an epoxy resin to impregnate the other side of the foam plastic, which has a different pigmentation, a layered body is created after compression and hardening, whose sides are colored differently by other additions to that used to impregnate the Resins used on both sides of the foam plastic Can be used on both sides of the too various mechanical and / or chemical properties are imparted to the laminated body forming.

To produce a layered body, in which the foam plastic consists of two layers, takes place According to the invention, the impregnation or coating of the two foam plastic layers with two different synthetic resin compositions that when compressing and hardening the connective Form boundary layer.

If the two synthetic resins used for impregnation are provided with different color pigments, so the boundary layer has another; Color scheme on. Such a pronounced coloring of the thin Boundary layer indicates a copolymerization in this contact area of the two synthetic resins. Especially when different synthetic resin compositions are used, for example polyester resin and epoxy resin, it is important to limit the mixing of the synthetic resin composition, the desired mechanical and / or chemical properties of each cured synthetic resin to be preserved in the laminate. Further, it is necessary to use synthetic resin compositions, which bond or polymerize at the boundary layer to achieve the required laminate strength of the cured laminate to ensure.

In the drawing, exemplary embodiments of laminated bodies according to the invention are shown. In the Drawing shows

F i g. 1 shows an illustration of the individual layers used to form the laminated body before compression and curing the resin;

F i g. 2 shows a section through the in FIG. I shown but superimposed layers before compression and curing the resin;

Fig.3 is a section through the finished Laminated body after compressing and curing the synthetic resin;

4 shows an enlarged illustration of the laminated body according to FIG. 3;

F i g. 5 shows a representation of the layers to be joined together to form a layer body after a second Embodiment before the compression and hardening of the synthetic resin;

F i g. 6 shows a section through the in F i g. 5 but superimposed layers before compression and curing the resin;

F i g. 7 shows a section through the finished laminated body after compressing the layers and the Curing the resin and

8 shows an enlarged representation of the section according to FIG. 7th

A first exemplary embodiment is shown in FIG. I to 4 illustrated. Fig. 1 shows an illustration of the individual layers that are used to manufacture the laminated body. Layers IO and 12 consist of soft-elastic. open-cell foam plastic, for example a polyurethane foam.

An open-cell foam plastic is to be understood as meaning a foam plastic, of which Pores 85% are in direct connection with the adjacent pores.

The inner surfaces 14,16 of the foam plastic layers are facing each other, while the outer surfaces 18, 20 of the foam plastic layers 10 and 12 Reinforcing fiber layers 22 and 24 are adjacent. These reinforcing fiber layers can be replaced by glass fiber mats or be formed by woven glass fibers.

The foam plastic layers 10 and 12 are impregnated with synthetic resin. In the embodiment shown in the drawing, the layer 10 is impregnated with a polyester resin, while the foam plastic layer 12 is impregnated with an epoxy resin. Both layers thus represent storage for the still liquid synthetic resin compositions. The thickness of the two layers 10 and 12 is determined by the amount of synthetic resin composition required to fill the pores and by the desired thickness of the finished layer. In practice it is customary to use a foam plastic layer with a thickness of 25 mm or less, which has a density of about 8 to 80 kg / m ³ . The two foam plastic layers 10 and 12 can be impregnated in a known manner by dipping, the layers each being passed through a synthetic resin bath and then passing through nip rollers in order to leave the required amount of liquid synthetic resin in the pores.

The in F i g. The layers shown in FIG. 1 are placed on top of one another and then compressed. By the When compressed, the two foam plastic layers 10 and 12 get a thickness between 50 and! 0% their initial strength. As layers 10 and 12 compress, the resin compositions fill all open pores now [laughed at] and the excess de; · synthetic resin composition tfi driven out of the layers to their inner surfaces 14 and 16 and their outer surfaces 18 and 20. Included the two synthetic resin compositions embed the adjacent fiber reinforcement layer 22 and 24, respectively. On the other hand, the inward movement, i.e. H. the flow of the resin compositions to the Inner surfaces 14 and 16 of the foam plastic layers 10 and 12 for reasons that are not fully understood on, and there is no penetration into the adjacent foam plastic layer or only to a very small extent Dimensions. Rather, each resin composition appears to prevent the other from penetrating, so that the mixing of the synthetic resin compositions takes place only in the area of a boundary layer.

F '. G. 3 and 4 show that a copolymerization between the two synthetic resin compositions only leads to a very thin central boundary layer 26 which consists of a synthetic resin which differs from the synthetic resin compositions in the two adjacent layers 10 and 12. In particular, when the two synthetic resin compositions have the same color, it is possible to observe the very thin boundary layer 26 between the two foam plastic layers 10 and 12, since this thin boundary layer has a slightly different color than the cured Kurite resins in the two layers 10 and has 12. It is therefore possible that such a limited copolymerization could create a boundary layer between the two synthetic resin compositions.

which allows the synthetic resin compositions to penetrate in the layers impregnated with these prevented.

The following is an example of the materials used to make the laminate shown in Figures 1-4, which is very light and of high strength .

1. Foam plastic layers

Soft, elastic, open-cell foam plastic with a thickness of 12.7 mm and a density of 28.8 kg / m '.

2. Reinforcement fiber layers

Glass fiber mat with chopped or continuous fibers weighing OJ kg / m ^; .

J. F. First synthetic resin composition

l - ^ ,. v., l,., r, (»! Sei · I-1 or ·» Qlioll) mil arWiili licrlpn

Diethylenetriamines plus fillers and extenders upon need.

4. Second synthetic resin composition

Polyester resin [Hatco GR 13 031: (87 parts)] with an additive [Union Carbide LP 90: 13 parts)] and a peroxide catalyst and a zinc stearate release agent.

In Fig. 5 to 8 is a second embodiment shown. In this case, only a single layer of a flexible, open / urgent foam plastic is used 30 is used, the outer surfaces 32 and 14 reinforcement fiber layers 36 and 38 are adjacent. The foam plastic layer 30 and the reinforcing fiber layers 36 and 38 can be of the same type and be of the same construction as in the above-described embodiment.

One side, for example the entire outer surface 32

the foam plastic layer 30 is impregnated with polyester resin, while the other side, namely the Outer surface 34 with an uncured epoxy resin

• i is impregnated. After impregnation, the two reinforcement fiber layers 36 and 38 are applied to the foam plastic layer 30. Fig.6 shows a section through the layers prepared in this way.

Layers 36, 30 and 38 are placed in a die

ίο introduced or placed between press plates, and then compressed and the resin finally cured. During the compression, the synthetic resin compositions contained in the pores of the foam plastic layer 30 flow against each other and out

ι ', the layer 30 to the outer surfaces .32 and 34 out. In the process, all pores of the foam plastic layer 30 are filled and the fibers of the reinforcing fiber layers 36 and 38 are each rinwphciiiM of the synthetic resin composition. with which the adjacent side of the

; o Foam plastic layer 30 has been impregnated. Around in the middle of the foam plastic layer 30 is formed When the two synthetic resin compositions come into contact with one another, a boundary layer 40 occurs. Here, too, this occurs Boundary layer only limited mixing or

: s Copolymerization of the two synthetic resin compositions, with which the two sides of the foam plastic cliicht 30 has been impregnated.

You can also use more than two resin compositions impregnated foam plastic layers

can be used in, for example three. There are for example the outer layers are impregnated with a polyester resin, while the intermediate layer is impregnated with an epoxy resin. The resin compositions must be interrelated

ii be tolerable.

For this purpose 2 sheets of drawings

Claims (5)

Patent claims: 1. Laminated body made of flexible, open-cell foam plastic, the pores of which with a hardened synthetic resin are filled and both sides are covered with reinforcing fiber layers, the fibers of which are embedded in cured synthetic resin, characterized in that the one of the two fiber layers and the pores of the adjacent half of the foam plastic is embedded in a first, cured synthetic resin or is filled by this, while the other Fiber layer and the pores of this adjacent other half of the foam plastic in one second cured synthetic resin is embedded or filled by this, with a middle one Boundary layer (40) contains both cured synthetic resins. 2. Laminated body made of flexible, open-cell foam plastic, the pores of which are filled with a hardened synthetic resin and which is covered on both sides with reinforcing fiber layers, the fibers of which are embedded in hardened synthetic resin, characterized in that the foam plastic consists of two layers and that the pores the one layer and the fiber layer assigned to it are filled with a first cured synthetic resin or is embedded in this synthetic resin and that the pores of the second layer and the fiber layer associated with this are filled with a second cured synthetic resin or is embedded in this synthetic resin ui Ί that between the two foam plastic layers one of these two firmly interconnecting boundary layer (26) is present, which contains both synthetic resins 3. Laminated body according to claim I or 2, characterized in that the first synthetic resin is a Polyester resin and the second is an epoxy resin 4. The method for producing a laminated body according to claim 1, wherein the foam plastic with uncured synthetic resin is impregnated or coated, then brought together with the fiber layers, then this layer is compressed the fiber layers are embedded in the synthetic resin, and finally the synthetic resin is cured, characterized in that the impregnation or coating with two different synthetic resin compositions is carried out by one on one side of the foam plastic and the other on its other side. 5. The method for producing a laminated body according to claim 2, wherein the foam plastic with uncured synthetic resin is impregnated or coated, then brought together with the fiber layers, then this layer is compressed the fiber layers are embedded in the synthetic resin, and finally the synthetic resin is cured, characterized in that the impregnation or coating of the two foam plastic layers is carried out with two different synthetic resin compositions which form the connecting boundary layer (26) during compression and curing.